function deleteCookie( name ) {
	var c_value = getCookie(name);
	if ( c_value != null && c_value != "") document.cookie = name + '=' +
			';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}

function getCookie(c_name) {
	if (document.cookie.length>0) {
		c_start = document.cookie.indexOf(c_name + "=");
		if (c_start!=-1){
			c_start = c_start + c_name.length+1;
			c_end = document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end = document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		}
	}
	return "";
}

function setCookie(c_name,value,expiredays){
	var exdate = new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie = c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}